Method for reducing net level of bearing steel wire rod carbide

A carbide and bearing steel technology, which is applied in the field of reducing the carbide network level of bearing steel wire rod, can solve the problems of bearing steel wear resistance and service life can not be well optimized

Inactive Publication Date: 2009-11-25
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

[0004] Although the above two methods can control the carbide level of bearing steel to a certain extent, their shortcoming is that the carbide network level of their products can only be maintained at ≥ 1.0 level, so that the wear resistance and service life of bearing steel cannot be improved. well optimized

Method used

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  • Method for reducing net level of bearing steel wire rod carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Method for producing hot-rolled wire rod with a diameter of Ф14 mm

[0020] 1) Heat 150mm×150mm continuous casting high-carbon chromium bearing billet, start rolling in the high-temperature recrystallization zone at 1130°C, carry out rough rolling, intermediate rolling and pre-finish rolling, after rolling through 17 rolling mills, the diameter of the rolled piece is Ф20 .8mm, area is 339.8mm 2 , cumulative elongation n 1 = 66.2 times;

[0021] 2) Water-through cooling (pre-water cooling) is carried out after the pre-finish rolling to adjust the temperature of the core and surface of the billet. The cooling rate of the pre-water cooling is controlled at 25°C / s, and the cooling time is 2.0s;

[0022] 3) Carry out 4 passes of finish rolling treatment, the start temperature of finish rolling is 950°C, and the temperature after finish rolling is 990°C (finish rolling temperature);

[0023] 4) After the finishing rolling, the rolled piece is subjected to wat...

Embodiment 2

[0025] Embodiment 2: Method for producing hot-rolled wire rod with diameter Ф5.5 mm

[0026] 1) Heat the 150mm×150mm continuous casting bearing steel billet, and start rolling at 1030°C. After rough rolling, intermediate rolling, and pre-finish rolling, the diameter of the rolled piece is Ф16mm and the area is 201.1mm 2 , cumulative elongation n 1 = 111.9 times;

[0027] 2) Water-through cooling (pre-water cooling) is carried out after the pre-finish rolling to adjust the temperature of the core and surface of the billet. The cooling speed of the pre-water cooling is controlled at 15°C / s, and the cooling time is 2.2s;

[0028] 3) Carry out 10 passes of finish rolling, the start temperature of finish rolling is 900°C, and the temperature after finish rolling is 920°C (finish rolling temperature);

[0029] 4) After the finish rolling, the rolled piece is subjected to accelerated cooling through water penetration, the initial cooling temperature is 920°C, the cooling speed is c...

Embodiment 3

[0031] Embodiment 3: Method for producing hot-rolled wire rod with a diameter of Ф8mm

[0032] 1) Heat the 150mm×150mm continuous casting bearing steel billet, and start rolling at 1092°C. After rough rolling, intermediate rolling, and pre-finish rolling, the diameter of the rolled piece is Ф18.5mm and the area is 268.6mm 2 , cumulative elongation n 1 = 83.7 times;

[0033] 2) Water-through cooling (pre-water cooling) is carried out after the pre-finish rolling to adjust the temperature of the core and surface of the billet. The cooling rate of the pre-water cooling is controlled at 40°C / s, and the cooling time is 0.8s;

[0034] 3) Carry out 8 passes of finish rolling, the start temperature of finish rolling is 940°C, and the temperature after finish rolling is 950°C (finish rolling temperature);

[0035] 4) After the finishing rolling, the rolled piece is subjected to accelerated cooling through water penetration, the initial cooling temperature is 950°C, the cooling rate i...

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Abstract

The invention discloses a method for reducing net level of bearing steel wire rod carbide, including the following steps: firstly, bearing steel continuous casting billet is heated and warmed up, and rough rolling, medium rolling and pre-finishing treatments are carried out at the temperature of 1030 to 1130 DEG C, so that the accumulated elongation percentage n1 of rolled pieces is 65 to 120 times; secondly, pre-hydrocooling treatment of rolled pieces is carried out, the cooling speed is controlled in the range of 10 to 40 DEG C per second, and the cooling time is controlled in the range of 0.8 to 2.2 seconds; then 4 to 10 sub-finishing treatments of rolled pieces are carried out, the start-rolling temperature is controlled in the range of 900 to 950 DEG C, and the final-rolling temperature is controlled in the range of 920 to 990 DEG C; then the rolled pieces are in hydrocooling treatment, the cooling speed is controlled in the range of 50 to 350 DEG C per second, the spinning temperature is controlled in the range of 760 to 820 DEG C, and dispersed rolls are manufactured; finally, the dispersed rolls are in air-cooled treatment, the air-cooled speed is controlled in the range of 2 to 10 DEG C per second, the roll collection temperature when the dispersed rolls come out of air-cooled roller way is controlled in the range of 330 to 450 DEG C, and the dispersed rolls are disposed in environmental air and cooled till room temperature. The products produced by using the method have 95% of carbide whose net level is less than or equal to 1.0 in which the average level is 0.95, thereby being capable of increasing abrasion resistance and service life of steel.

Description

technical field [0001] The invention belongs to the field of production and processing of steel wire rods, and specifically refers to a method for reducing the carbide network level of bearing steel wire rods. Background technique [0002] High-carbon chromium bearing steel wire rod is mainly used to manufacture bearing rolling elements. The structure of high-carbon chromium bearing steel is that excessive carbides are distributed on the martensitic matrix. This is because the carbon in high-carbon chromium bearing steel The content is high, and it also contains a certain amount of chromium. There are a large number of eutectic carbides in the slab. When the slab is heated, most of these carbides melt back into the austenite, but a small amount of carbides are not melted. The molten part is precipitated again during rolling or cooling after rolling, forming carbide liquid precipitation, carbide band, and carbide network structure. During the use of the bearing, its wear res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06
Inventor 陈庆丰吴卫明李媛张贤忠熊玉彰杨友明许竹桃张青山关云劭主彪曾敏吴爱美吕坤徐冠宇
Owner 武钢集团有限公司
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